Examples with Signature net.i2p.data.Signature used on opensource projects

Example 31 with Signature

use of net.i2p.data.Signature in project i2p.i2p by i2p.

the class DSAEngine method signIt.

/**
 *  Sign using DSA-SHA1 or Syndie DSA-SHA256 ONLY.
 *
 *  @param hash either a Hash or a SHA1Hash
 *  @return null on error
 *  @since 0.8.3
 */
private Signature signIt(SimpleDataStructure hash, SigningPrivateKey signingKey) {
    if ((signingKey == null) || (hash == null))
        return null;
    if (signingKey.getType() != SigType.DSA_SHA1)
        throw new IllegalArgumentException("Bad key type " + signingKey.getType());
    long start = _context.clock().now();
    BigInteger k;
    boolean ok;
    do {
        k = new NativeBigInteger(160, _context.random());
        ok = k.compareTo(CryptoConstants.dsaq) != 1;
        ok = ok && !k.equals(BigInteger.ZERO);
    // System.out.println("K picked (ok? " + ok + "): " + k.bitLength() + ": " + k.toString());
    } while (!ok);
    BigInteger r = CryptoConstants.dsag.modPowCT(k, CryptoConstants.dsap).mod(CryptoConstants.dsaq);
    BigInteger kinv = k.modInverse(CryptoConstants.dsaq);
    BigInteger M = new NativeBigInteger(1, hash.getData());
    BigInteger x = new NativeBigInteger(1, signingKey.getData());
    BigInteger s = (kinv.multiply(M.add(x.multiply(r)))).mod(CryptoConstants.dsaq);
    byte[] rbytes = r.toByteArray();
    byte[] sbytes = s.toByteArray();
    byte[] out = new byte[40];
    // (q^random)%p is computationally random
    _context.random().harvester().feedEntropy("DSA.sign", rbytes, 0, rbytes.length);
    if (rbytes.length == 20) {
        // System.arraycopy(rbytes, 0, out, 0, 20);
        for (int i = 0; i < 20; i++) {
            out[i] = rbytes[i];
        }
    } else if (rbytes.length == 21) {
        // System.arraycopy(rbytes, 1, out, 0, 20);
        for (int i = 0; i < 20; i++) {
            out[i] = rbytes[i + 1];
        }
    } else if (rbytes.length > 21) {
        _log.error("Bad R length " + rbytes.length);
        return null;
    } else {
        // System.arraycopy(rbytes, 0, out, 20 - rbytes.length, rbytes.length);
        for (int i = 0; i < rbytes.length; i++) out[i + 20 - rbytes.length] = rbytes[i];
    }
    if (sbytes.length == 20) {
        // System.arraycopy(sbytes, 0, out, 20, 20);
        for (int i = 0; i < 20; i++) {
            out[i + 20] = sbytes[i];
        }
    } else if (sbytes.length == 21) {
        // System.arraycopy(sbytes, 1, out, 20, 20);
        for (int i = 0; i < 20; i++) {
            out[i + 20] = sbytes[i + 1];
        }
    } else if (sbytes.length > 21) {
        _log.error("Bad S length " + sbytes.length);
        return null;
    } else {
        // System.arraycopy(sbytes, 0, out, 40 - sbytes.length, sbytes.length);
        for (int i = 0; i < sbytes.length; i++) out[i + 20 + 20 - sbytes.length] = sbytes[i];
    }
    long diff = _context.clock().now() - start;
    if (diff > 1000) {
        if (_log.shouldLog(Log.WARN))
            _log.warn("Took too long to sign (" + diff + "ms)");
    }
    return new Signature(out);
}

Example 32 with Signature

use of net.i2p.data.Signature in project i2p.i2p by i2p.

the class HostTxtEntry method hasValidSig.

/**
 * Verify with the dest public key using the "sig" property
 */
public boolean hasValidSig() {
    if (props == null || name == null || dest == null)
        return false;
    if (!isValidated) {
        isValidated = true;
        StringWriter buf = new StringWriter(1024);
        String sig = props.getProperty(PROP_SIG);
        if (sig == null)
            return false;
        buf.append(name);
        buf.append(KV_SEPARATOR);
        buf.append(dest);
        try {
            writeProps(buf, true, false);
        } catch (IOException ioe) {
            // won't happen
            return false;
        }
        byte[] sdata = Base64.decode(sig);
        if (sdata == null)
            return false;
        Destination d;
        try {
            d = new Destination(dest);
        } catch (DataFormatException dfe) {
            return false;
        }
        SigningPublicKey spk = d.getSigningPublicKey();
        SigType type = spk.getType();
        if (type == null)
            return false;
        Signature s;
        try {
            s = new Signature(type, sdata);
        } catch (IllegalArgumentException iae) {
            return false;
        }
        isValid = DSAEngine.getInstance().verifySignature(s, DataHelper.getUTF8(buf.toString()), spk);
    }
    return isValid;
}

Example 33 with Signature

use of net.i2p.data.Signature in project i2p.i2p by i2p.

the class HostTxtEntry method signIt.

/**
 * @param sigprop The signature property to set
 */
private void signIt(SigningPrivateKey spk, String sigprop) {
    if (props == null)
        throw new IllegalStateException();
    if (props.containsKey(sigprop))
        throw new IllegalStateException();
    if (!props.containsKey(PROP_DATE))
        props.setProperty(PROP_DATE, Long.toString(System.currentTimeMillis() / 1000));
    StringWriter buf = new StringWriter(1024);
    buf.append(name);
    buf.append(KV_SEPARATOR);
    buf.append(dest);
    try {
        writeProps(buf);
    } catch (IOException ioe) {
        throw new IllegalStateException(ioe);
    }
    Signature s = DSAEngine.getInstance().sign(DataHelper.getUTF8(buf.toString()), spk);
    if (s == null)
        throw new IllegalArgumentException("sig failed");
    props.setProperty(sigprop, s.toBase64());
}

Example 34 with Signature

use of net.i2p.data.Signature in project i2p.i2p by i2p.

the class HostTxtEntry method hasValidInnerSig.

/**
 * Verify with the "olddest" property's public key using the "oldsig" property
 */
public boolean hasValidInnerSig() {
    if (props == null || name == null || dest == null)
        return false;
    boolean rv = false;
    // don't cache result
    if (true) {
        StringWriter buf = new StringWriter(1024);
        String sig = props.getProperty(PROP_OLDSIG);
        String olddest = props.getProperty(PROP_OLDDEST);
        if (sig == null || olddest == null)
            return false;
        buf.append(name);
        buf.append(KV_SEPARATOR);
        buf.append(dest);
        try {
            writeProps(buf, true, true);
        } catch (IOException ioe) {
            // won't happen
            return false;
        }
        byte[] sdata = Base64.decode(sig);
        if (sdata == null)
            return false;
        Destination d;
        try {
            d = new Destination(olddest);
        } catch (DataFormatException dfe) {
            return false;
        }
        SigningPublicKey spk = d.getSigningPublicKey();
        SigType type = spk.getType();
        if (type == null)
            return false;
        Signature s;
        try {
            s = new Signature(type, sdata);
        } catch (IllegalArgumentException iae) {
            return false;
        }
        rv = DSAEngine.getInstance().verifySignature(s, DataHelper.getUTF8(buf.toString()), spk);
    }
    return rv;
}

Example 35 with Signature

use of net.i2p.data.Signature in project i2p.i2p by i2p.

the class HostTxtEntry method signRemove.

/**
 * Sign as a "remove" line #!dest=dest#name=name#k1=v1#sig=sig...]
 * Must have been constructed with non-null properties.
 */
public void signRemove(SigningPrivateKey spk) {
    if (props == null)
        throw new IllegalStateException();
    if (props.containsKey(PROP_SIG))
        throw new IllegalStateException();
    props.setProperty(PROP_NAME, name);
    props.setProperty(PROP_DEST, dest);
    if (!props.containsKey(PROP_DATE))
        props.setProperty(PROP_DATE, Long.toString(System.currentTimeMillis() / 1000));
    StringWriter buf = new StringWriter(1024);
    try {
        writeProps(buf);
    } catch (IOException ioe) {
        throw new IllegalStateException(ioe);
    }
    props.remove(PROP_NAME);
    props.remove(PROP_DEST);
    Signature s = DSAEngine.getInstance().sign(DataHelper.getUTF8(buf.toString()), spk);
    if (s == null)
        throw new IllegalArgumentException("sig failed");
    props.setProperty(PROP_SIG, s.toBase64());
}